:root {
            --primary: #1968b3;
            --primary-dark: #0f4a82;
            --primary-light: #e8f1fa;
            --ink: #1f2933;
            --muted: #5f6b76;
            --line: #d9e2ec;
            --bg: #f4f7fa;
            --white: #ffffff;
            --accent: #c8553d;
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }

        html { scroll-behavior: smooth; }

        body {
            font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.7;
            font-size: 17px;
            -webkit-font-smoothing: antialiased;
        }

        a { color: var(--primary); text-decoration: none; }
        a:hover { color: var(--primary-dark); text-decoration: underline; }

        /* Header */
        .site-header {
            background: var(--white);
            border-bottom: 4px solid var(--primary);
            box-shadow: 0 2px 12px rgba(25, 104, 179, 0.08);
        }

        .header-inner {
            max-width: 1100px;
            margin: 0 auto;
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
        }

        .brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.2px;
            line-height: 1.3;
        }

        .brand small {
            display: block;
            font-size: 0.78rem;
            font-weight: 500;
            color: var(--muted);
            text-transform: uppercase;
            letter-spacing: 1.2px;
            margin-top: 2px;
        }

        /* Navbar */
        .main-nav { background: var(--primary); }

        .main-nav ul {
            max-width: 1100px;
            margin: 0 auto;
            padding: 0 12px;
            list-style: none;
            display: flex;
            flex-wrap: wrap;
        }

        .main-nav li a {
            display: block;
            padding: 13px 16px;
            color: var(--white);
            font-size: 0.95rem;
            font-weight: 500;
            transition: background 0.2s ease;
        }

        .main-nav li a:hover {
            background: var(--primary-dark);
            text-decoration: none;
        }

        /* Main */
        main {
            max-width: 900px;
            margin: 0 auto;
            padding: 40px 20px 60px;
        }

        h1 {
            font-size: 2.3rem;
            line-height: 1.25;
            color: var(--primary-dark);
            margin-bottom: 28px;
            padding-bottom: 16px;
            border-bottom: 3px solid var(--primary);
            position: relative;
        }

        h1::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -3px;
            width: 90px;
            height: 3px;
            background: var(--accent);
        }

        article {
            background: var(--white);
            border: 1px solid var(--line);
            border-radius: 10px;
            padding: 36px 40px;
            box-shadow: 0 4px 18px rgba(31, 41, 51, 0.05);
            overflow-wrap: break-word;
            word-wrap: break-word;
        }

        article h2, article h3, article h4, article h5, article h6 {
            color: var(--primary-dark);
            line-height: 1.3;
            margin: 1.6em 0 0.6em;
        }

        article > :first-child { margin-top: 0; }
        article h2 { font-size: 1.7rem; }
        article h3 { font-size: 1.4rem; }
        article h4 { font-size: 1.2rem; }

        article p { margin-bottom: 1.1em; }

        article ul, article ol { margin: 0 0 1.1em 1.5em; }
        article li { margin-bottom: 0.4em; }

        article blockquote {
            margin: 1.4em 0;
            padding: 14px 20px;
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            color: var(--muted);
            border-radius: 0 6px 6px 0;
        }

        article table {
            width: 100%;
            border-collapse: collapse;
            margin-bottom: 1.2em;
            display: block;
            overflow-x: auto;
        }

        article th, article td {
            border: 1px solid var(--line);
            padding: 10px 12px;
            text-align: left;
        }

        article th { background: var(--primary-light); color: var(--primary-dark); }

        /* Transition paragraph */
        .transition {
            margin-top: 32px;
            padding: 24px 28px;
            background: var(--primary-light);
            border-left: 5px solid var(--primary);
            border-radius: 0 10px 10px 0;
            color: var(--ink);
        }

        .transition p { margin-bottom: 1em; }
        .transition p:last-child { margin-bottom: 0; }

        /* Links block */
        .links-block {
            margin-top: 32px;
            background: var(--white);
            border: 1px solid var(--line);
            border-top: 4px solid var(--primary);
            border-radius: 10px;
            padding: 30px 36px;
            box-shadow: 0 4px 18px rgba(31, 41, 51, 0.05);
        }

        .links-block h3 {
            font-size: 1.2rem;
            color: var(--primary-dark);
            margin: 28px 0 12px;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--line);
        }

        .links-block h3:first-child { margin-top: 0; }

        .links-block ul {
            list-style: none;
            columns: 2;
            column-gap: 40px;
            margin: 0;
            padding: 0;
        }

        .links-block li {
            break-inside: avoid;
            padding: 6px 0 6px 18px;
            position: relative;
            overflow-wrap: break-word;
            word-wrap: break-word;
        }

        .links-block li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 15px;
            width: 7px;
            height: 7px;
            background: var(--accent);
            border-radius: 50%;
        }

        .links-block a { font-weight: 500; }

        /* Footer */
        .site-footer {
            background: var(--primary-dark);
            color: #dbe7f3;
            border-top: 4px solid var(--accent);
        }

        .footer-inner {
            max-width: 1100px;
            margin: 0 auto;
            padding: 30px 24px;
            text-align: center;
        }

        .footer-inner .footer-brand {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--white);
            margin-bottom: 14px;
        }

        .footer-nav {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 6px 22px;
        }

        .footer-nav a { color: #dbe7f3; font-size: 0.93rem; }
        .footer-nav a:hover { color: var(--white); }

        /* Responsive */
        @media (max-width: 768px) {
            body { font-size: 16px; }
            h1 { font-size: 1.8rem; }
            article { padding: 26px 22px; }
            .links-block { padding: 24px 22px; }
            .main-nav ul { padding: 0; }
            .main-nav li { flex: 1 1 50%; }
            .main-nav li a { text-align: center; padding: 12px 8px; }
        }

        @media (max-width: 560px) {
            .links-block ul { columns: 1; }
            .header-inner { padding: 16px; justify-content: center; text-align: center; }
            main { padding: 28px 14px 44px; }
            h1 { font-size: 1.55rem; }
            article { padding: 22px 16px; }
            .transition { padding: 18px 18px; }
        }